HELP Best 5.1 amplification for under $2000

I’m searching for a receiver or a Prepro & Amp combination to drive a 5.1 home theater with classic Mirage speakers. I'm considering a B&K 307 receiver (demo) but am looking for other options, used is OK.
The 2 extra channels are for a second zone.
The usage is 40% 2ch Music & 60% HT.
Too many options out there and I need experienced advice!
thanx